Venting apparatus for motors



Feb. 2, 1,925. 1,571,550

l T. P. KIMMAN VENTING APPARATUS FOR MOTORS Filed Jan. 3. 1922 PatentedFeb. 2, 1926.

UNlTED TES 1,511,550V PATENT o FFic THEODORE B'KIMMAN, 0F CLEVELAND,OEI, ASSIGNOR T@ CHICA@ BNEH'IIC T0013 COMPANY, OF NEW YORK, N. Y., ACURPRATIGH 0E NEW mY.

VENTNG LPPARA-T'S FOR MTGRS.

Application filed January 32 intl-2. Serial. No. 536,652.

To all whom 'it may concern.'

Be it known that I, THEoDoRE` l). KXMMAN, a citizen ci the UnitedStates," residing at Cleveland, in they county of Cuyahoga and State ofOhio, have invented certain new and useful improvements in VentingApparatus for Motors, of which the following is a speciiication. -Y

My invention relates in general to motors and specifically to the motorsof hand operated (xr-portable tools, such as machines for grinding,polishing, buiing, brushing and the like, and more particularly toimproved venting means for permitting escape or exhaust of air,compressed in the crank case, whileprevcnting escape ot the lubricatingoil `with the air. Pneumatically operated tools are necessarily operatedat high speeds and therefore require constant and efficient lubrication,which is usually .of the type iin which the oil is splashed or thrown 0Hby the crank shaft. Some of the compressed air, conducted to thecylinders to operate the pistons and hence the crank shaft, escapes W"past the pistons into the crank case, Where the pistons tend, tocompress it. Venting means have been used prior to my invention topermit the excess air to be 'exhausted from the crank case', but suchventing means have 30 proven deficient and objectional, in that noprovision has been made to prevent escape of the lubricating oilwithlthe air.

The-principal object of my invention is to provide means for eifectuallypreventing thev 35 lubricating oil from being carried' out of the crank'case with the air escaping through the vent tube or conduit. To thisend, l provide a simple,v durable and highly ecient centrifugal. device,which separates the oil from the air escaping` through the vent tube.With the above and incidental objects in view, the invention consists incertain -novel features of construction and combinations oi parts, theessential elements whereof are recited in the appended claims and thepreferred form oi embodiment of which is described' in detailhereinafter and illustrated in tull in the accompanying drawings, whichform part of this specification.

@t said drawings, liig. 1 is a sectional elevation'oi a pneumatic tool,embodying my invention, and llig. 2 is a cross-section through the tool,as on the line 2-2 oi Fig, l. r Referring to the drawings, the pneumatictool shown is or' a well known construction andmay he used for grinding,polishing, v bulling and similar purposes. It comprises in general thecasing 6, opposed cylinders 7, arranged at an angle ci 90 with respectto each other, a crank shaft 8, connected byconnecting rods to thepistons in the cylinders, av handle 13 for holding the tool andcontrolling its operation, and a tool shaft 10, operated by the crankshaft through the medium of gears 11 and 12. The casing ti comprises thecentral portion or body cast integral with the cylinders v7, and end cas or cases 14 and 15, which carry suitab e bearings tor-supporting thecrank shaft 8 and shaft 10.' The gear case 15 is provided with a tubularextension 15a for housing part of the shaft l0, and at its outer endcarries fa shield or guard 16 which is positioned around the wheel (notshown), which is mounted on the end of the shaft for performing thefunction for which the tool is to Abe used. The extension 15 alsocarries bearings'lb for the tool shaft 10. I have' shown a tool of thetype described for the` purpose of illustration only and' it is to beunderstood that my invention is susceptible of use in pneumatic tools ormotors used for di'erent purposes than those mentioned above, and that Ido not intend to limit the application of m invention to pneumatic toolsof any speci c kind. Y

he means, constituting the subject matter of my invention, comprisesv avent tube 17, a centrifugal oil separator 18 and a plate or cover 19 onthe tube. The tube 17 1s securedv at its upper end and by any suitablemeans in an opening in the to of the tool casing and it is bent intermeiate its ends so that its opposite end portion extends hori zontally andintothe separator 18. The separator is cylindrical in :torni and has e.large chamber 2O in one end. e wall ot the chamber 20 is rovided withholes 2l.. The opposite end cip the separator 18 is pro vided with ascrew threaded projection 22 which is screwed into a screw threaded recess 23 in the inner end oi the tool shaft 10, so that the separator isiin arial ment and rotated as a 'unit `with the tool shaft 10. The disheddisc or cup like plate 19 is provided with a central open ing throughwhich the pipe or tube 'l'l on tends and the disc 19 has a projectingbrachet or toot 2d secured to a portion 25 oit the tool casing 6 by anydesired means such as mi Miti der

screws. It will be noted that the vent tube 17 and associated device,for preventing escape of oil, are positioned between theoposedcylinders, While the crank shaft 8 1s positioned in the bottom ofthe apparatus.

From the above descriptiomthe operation. of the mechanism,` embodying myinvention, will be apparent.. that the lubricating oil is to bemaintained at the desired level in the crank case, and

that the oil is splashed or thrown by the crank shaft and connections tolubricate the travelin device. The air, which escapes from thecylinders, pastr the pistons and into the crank case, upon beingcompressed in he crank case escapes through the chamber 2O of the end oft e tube.

l have described above one form of emi bodiment of my invention, but itis lto be understood that the invention is susceptibleof various changesand modificatinsfall coming Within the scope andA spiritnf'iny pinvention, as defined in the following claims.

I claim:

1. Means for venting the crank casing of a motor comprising aventpassage opening into a chamber within said casing, said chamber having aperforate wail adapted to be rotated when the motor is in operationwhereby7 centrifugal force is utilized to re-- strain lubricant splashedabout4 in the casing from entering said passage.

2. A venting device for the crank casing of a motor coriprisiwY arotatable chamber within the casing, l chamber having an apen end ope inthe walls thereof, a vent duct g the open end ci' said chamber, a at ctor assceiated with It will be understood along the tube 17 into theopen chamber, and means for rotating said chamber when .the motor is inoperation, Whereby lubricant splashed inte and upon said chamber orcarried -therein by the vented gases is `returned lby centrifugal forceto the casing. v

3. In a device of the class described, the combination of a casing, acrank shaft therein, lubricant in the casing, a perforated device openatan end to .permit escape of the air butprevent escape of-lubricanttherewith, a conduit through which the air escapes, and a stationaryplate over the open endh of said device.

4. I na device of the` class described, the combination of a casing, acrank shaft therein, llubricant in the casing, a perforated device open.at anlend to permit escape of the air lbut prevent cscapeof lubricanttherewith, a conduitthrough which the air escapes, and a stationaryplate over the open end of said device and through which the end of theconduit projects.

5. In a device of the class described, thc combination of a casing, acrank shaft therein, lubricant'in the casing, a tool shaft operated bythe'. crank shaft, a perforated dcvice secured to said tool shaftandopen at one end to permit escape of the air but prevent escape oflubricant therewith, a conduit through whichair escapes, and astationary plate over-j the open end of said device. y

6. venting device for the crank casing of a motor comprising a rotatablechamber within the casing, said chamber having an open end and openingsin the walls thereof, astationary deflector closing the open end of saidchamber, a vent duct extending through said deflector and terminatingwithin said chamber, and means for rotating said chamber when the motoris in operation. whereby the lubricant splashed about in said casing isprevented from passing out through said duct with the vented gases.

